if I could only fly 和if only i could fly

Question

if I could only fly 和if only i could fly区别if I could only fly 和if only i could fly？

Answer 1

If I could only fly: 如果我只能飞的话，语义上不算特别通顺
If only I could fly: 如果我会飞就好了，虚拟语气，如果你是在做选择题，八成是选这个

Answer 2

如果我只会飞翔。

如果我会飞翔就好了。